X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Ftincctl.c;h=f2b587c96bf1aa73e17d77addcf0e4d68ae2836c;hb=3074dad170a1c6755090bd12c3fb9903cde531ab;hp=a4bb5912ba2880720fe0e73935781963da1576b8;hpb=1af8ca58b86f5956d6acd9f63083a84666647ef0;p=tinc

diff --git a/src/tincctl.c b/src/tincctl.c
index a4bb5912..f2b587c9 100644
--- a/src/tincctl.c
+++ b/src/tincctl.c
@@ -1,6 +1,6 @@
 /*
     tincctl.c -- Controlling a running tincd
-    Copyright (C) 2007-2018 Guus Sliepen <guus@tinc-vpn.org>
+    Copyright (C) 2007-2021 Guus Sliepen <guus@tinc-vpn.org>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -40,6 +40,7 @@
 #include "tincctl.h"
 #include "top.h"
 #include "version.h"
+#include "subnet.h"
 
 #ifndef MSG_NOSIGNAL
 #define MSG_NOSIGNAL 0
@@ -92,6 +93,17 @@ static struct option const long_options[] = {
 static void version(void) {
 	printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 	       BUILD_VERSION, BUILD_DATE, BUILD_TIME, PROT_MAJOR, PROT_MINOR);
+	printf("Features:"
+#ifdef HAVE_READLINE
+	       " readline"
+#endif
+#ifdef HAVE_CURSES
+	       " curses"
+#endif
+#ifndef DISABLE_LEGACY
+	       " legacy_protocol"
+#endif
+	       "\n\n");
 	printf("Copyright (C) 1998-2018 Ivo Timmermans, Guus Sliepen and others.\n"
 	       "See the AUTHORS file for a complete list.\n\n"
 	       "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
@@ -125,12 +137,12 @@ static void usage(bool status) {
 		       "  reload                     Partially reload configuration of running tincd.\n"
 		       "  pid                        Show PID of currently running tincd.\n"
 #ifdef DISABLE_LEGACY
-		       "  generate-keys              Generate a new Ed25519 public/private keypair.\n"
+		       "  generate-keys              Generate a new Ed25519 public/private key pair.\n"
 #else
-		       "  generate-keys [bits]       Generate new RSA and Ed25519 public/private keypairs.\n"
-		       "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
+		       "  generate-keys [bits]       Generate new RSA and Ed25519 public/private key pairs.\n"
+		       "  generate-rsa-keys [bits]   Generate a new RSA public/private key pair.\n"
 #endif
-		       "  generate-ed25519-keys      Generate a new Ed25519 public/private keypair.\n"
+		       "  generate-ed25519-keys      Generate a new Ed25519 public/private key pair.\n"
 		       "  dump                       Dump a list of one of the following things:\n"
 		       "    [reachable] nodes        - all known nodes in the VPN\n"
 		       "    edges                    - all known connections in the VPN\n"
@@ -178,11 +190,13 @@ static bool parse_options(int argc, char **argv) {
 			break;
 
 		case 'c': /* config file */
+			free(confbase);
 			confbase = xstrdup(optarg);
 			confbasegiven = true;
 			break;
 
 		case 'n': /* net name given */
+			free(netname);
 			netname = xstrdup(optarg);
 			break;
 
@@ -195,6 +209,7 @@ static bool parse_options(int argc, char **argv) {
 			break;
 
 		case 3:   /* open control socket here */
+			free(pidfilename);
 			pidfilename = xstrdup(optarg);
 			break;
 
@@ -204,6 +219,7 @@ static bool parse_options(int argc, char **argv) {
 
 		case '?': /* wrong options */
 			usage(true);
+			free_names();
 			return false;
 
 		default:
@@ -224,6 +240,7 @@ static bool parse_options(int argc, char **argv) {
 
 	if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 		fprintf(stderr, "Invalid character in netname!\n");
+		free_names();
 		return false;
 	}
 
@@ -237,7 +254,7 @@ static bool parse_options(int argc, char **argv) {
 FILE *fopenmask(const char *filename, const char *mode, mode_t perms) {
 	mode_t mask = umask(0);
 	perms &= ~mask;
-	umask(~perms);
+	umask(~perms & 0777);
 	FILE *f = fopen(filename, mode);
 
 	if(!f) {
@@ -262,19 +279,21 @@ static void disable_old_keys(const char *filename, const char *what) {
 	bool disabled = false;
 	bool block = false;
 	bool error = false;
-	FILE *r, *w;
 
-	r = fopen(filename, "r");
+	FILE *r = fopen(filename, "r");
+	FILE *w = NULL;
 
 	if(!r) {
 		return;
 	}
 
-	snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
+	int result = snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
 
-	struct stat st = {.st_mode = 0600};
-	fstat(fileno(r), &st);
-	w = fopenmask(tmpfile, "w", st.st_mode);
+	if(result < sizeof(tmpfile)) {
+		struct stat st = {.st_mode = 0600};
+		fstat(fileno(r), &st);
+		w = fopenmask(tmpfile, "w", st.st_mode);
+	}
 
 	while(fgets(buf, sizeof(buf), r)) {
 		if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
@@ -416,7 +435,7 @@ ask_filename:
 }
 
 /*
-  Generate a public/private Ed25519 keypair, and ask for a file to store
+  Generate a public/private Ed25519 key pair, and ask for a file to store
   them in.
 */
 static bool ed25519_keygen(bool ask) {
@@ -424,7 +443,7 @@ static bool ed25519_keygen(bool ask) {
 	FILE *f;
 	char fname[PATH_MAX];
 
-	fprintf(stderr, "Generating Ed25519 keypair:\n");
+	fprintf(stderr, "Generating Ed25519 key pair:\n");
 
 	if(!(key = ecdsa_generate())) {
 		fprintf(stderr, "Error during key generation!\n");
@@ -480,7 +499,7 @@ error:
 
 #ifndef DISABLE_LEGACY
 /*
-  Generate a public/private RSA keypair, and ask for a file to store
+  Generate a public/private RSA key pair, and ask for a file to store
   them in.
 */
 static bool rsa_keygen(int bits, bool ask) {
@@ -725,6 +744,24 @@ static void logcontrol(int fd, FILE *out, int level) {
 	}
 }
 
+static bool stop_tincd(void) {
+	if(!connect_tincd(true)) {
+		return false;
+	}
+
+	sendline(fd, "%d %d", CONTROL, REQ_STOP);
+
+	while(recvline(fd, line, sizeof(line))) {
+		// wait for tincd to close the connection...
+	}
+
+	close(fd);
+	pid = 0;
+	fd = -1;
+
+	return true;
+}
+
 #ifdef HAVE_MINGW
 static bool remove_service(void) {
 	SC_HANDLE manager = NULL;
@@ -742,7 +779,12 @@ static bool remove_service(void) {
 	service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 
 	if(!service) {
-		fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
+		if(GetLastError() == ERROR_SERVICE_DOES_NOT_EXIST) {
+			success = stop_tincd();
+		} else {
+			fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
+		}
+
 		goto exit;
 	}
 
@@ -827,14 +869,17 @@ bool connect_tincd(bool verbose) {
 		return false;
 	}
 
-	struct sockaddr_un sa;
+	struct sockaddr_un sa = {
+		.sun_family = AF_UNIX,
+	};
 
-	sa.sun_family = AF_UNIX;
+	if(strlen(unixsocketname) >= sizeof(sa.sun_path)) {
+		fprintf(stderr, "UNIX socket filename %s is too long!", unixsocketname);
+		return false;
+	}
 
 	strncpy(sa.sun_path, unixsocketname, sizeof(sa.sun_path));
 
-	sa.sun_path[sizeof(sa.sun_path) - 1] = 0;
-
 	fd = socket(AF_UNIX, SOCK_STREAM, 0);
 
 	if(fd < 0) {
@@ -883,7 +928,6 @@ bool connect_tincd(bool verbose) {
 		return false;
 	}
 
-#ifdef HAVE_MINGW
 	unsigned long arg = 0;
 
 	if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
@@ -892,8 +936,6 @@ bool connect_tincd(bool verbose) {
 		}
 	}
 
-#endif
-
 	if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 		if(verbose) {
 			fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
@@ -963,10 +1005,12 @@ static int cmd_start(int argc, char *argv[]) {
 
 #endif
 
+	char *default_c = "tincd";
+
 	if(slash++) {
 		xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 	} else {
-		c = "tincd";
+		c = default_c;
 	}
 
 	int nargc = 0;
@@ -997,6 +1041,12 @@ static int cmd_start(int argc, char *argv[]) {
 #ifdef HAVE_MINGW
 	int status = spawnvp(_P_WAIT, c, nargv);
 
+	free(nargv);
+
+	if(c != default_c) {
+		free(c);
+	}
+
 	if(status == -1) {
 		fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 		return 1;
@@ -1009,6 +1059,11 @@ static int cmd_start(int argc, char *argv[]) {
 	if(socketpair(AF_UNIX, SOCK_STREAM, 0, pfd)) {
 		fprintf(stderr, "Could not create umbilical socket: %s\n", strerror(errno));
 		free(nargv);
+
+		if(c != default_c) {
+			free(c);
+		}
+
 		return 1;
 	}
 
@@ -1017,6 +1072,11 @@ static int cmd_start(int argc, char *argv[]) {
 	if(pid == -1) {
 		fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 		free(nargv);
+
+		if(c != default_c) {
+			free(c);
+		}
+
 		return 1;
 	}
 
@@ -1066,12 +1126,17 @@ static int cmd_start(int argc, char *argv[]) {
 	signal(SIGINT, SIG_DFL);
 #endif
 
-	if(failure || result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
+	bool failed = failure || result != pid || !WIFEXITED(status) || WEXITSTATUS(status);
+
+	if(failed) {
 		fprintf(stderr, "Error starting %s\n", c);
-		return 1;
 	}
 
-	return 0;
+	if(c != default_c) {
+		free(c);
+	}
+
+	return failed ? EXIT_FAILURE : EXIT_SUCCESS;
 #endif
 }
 
@@ -1083,9 +1148,11 @@ static int cmd_stop(int argc, char *argv[]) {
 		return 1;
 	}
 
-#ifndef HAVE_MINGW
+#ifdef HAVE_MINGW
+	return remove_service() ? EXIT_SUCCESS : EXIT_FAILURE;
+#else
 
-	if(!connect_tincd(true)) {
+	if(!stop_tincd()) {
 		if(pid) {
 			if(kill(pid, SIGTERM)) {
 				fprintf(stderr, "Could not send TERM signal to process with PID %d: %s\n", pid, strerror(errno));
@@ -1100,24 +1167,8 @@ static int cmd_stop(int argc, char *argv[]) {
 		return 1;
 	}
 
-	sendline(fd, "%d %d", CONTROL, REQ_STOP);
-
-	while(recvline(fd, line, sizeof(line))) {
-		// Wait for tincd to close the connection...
-	}
-
-#else
-
-	if(!remove_service()) {
-		return 1;
-	}
-
-#endif
-	close(fd);
-	pid = 0;
-	fd = -1;
-
 	return 0;
+#endif
 }
 
 static int cmd_restart(int argc, char *argv[]) {
@@ -1346,7 +1397,7 @@ static int cmd_dump(int argc, char *argv[]) {
 					color = "green";
 				}
 
-				printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
+				printf(" \"%s\" [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
 			} else {
 				if(only_reachable && !status.reachable) {
 					continue;
@@ -1376,9 +1427,9 @@ static int cmd_dump(int argc, char *argv[]) {
 				float w = 1 + 65536.0 / weight;
 
 				if(do_graph == 1 && strcmp(node1, node2) > 0) {
-					printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
+					printf(" \"%s\" -- \"%s\" [w = %f, weight = %f];\n", node1, node2, w, w);
 				} else if(do_graph == 2) {
-					printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
+					printf(" \"%s\" -> \"%s\" [w = %f, weight = %f];\n", node1, node2, w, w);
 				}
 			} else {
 				printf("%s to %s at %s port %s local %s port %s options %x weight %d\n", from, to, host, port, local_host, local_port, options, weight);
@@ -1717,18 +1768,18 @@ ecdsa_t *get_pubkey(FILE *f) {
 
 const var_t variables[] = {
 	/* Server configuration */
-	{"AddressFamily", VAR_SERVER},
+	{"AddressFamily", VAR_SERVER | VAR_SAFE},
 	{"AutoConnect", VAR_SERVER | VAR_SAFE},
 	{"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
 	{"BindToInterface", VAR_SERVER},
 	{"Broadcast", VAR_SERVER | VAR_SAFE},
 	{"BroadcastSubnet", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
 	{"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
-	{"DecrementTTL", VAR_SERVER},
+	{"DecrementTTL", VAR_SERVER | VAR_SAFE},
 	{"Device", VAR_SERVER},
 	{"DeviceStandby", VAR_SERVER},
 	{"DeviceType", VAR_SERVER},
-	{"DirectOnly", VAR_SERVER},
+	{"DirectOnly", VAR_SERVER | VAR_SAFE},
 	{"Ed25519PrivateKeyFile", VAR_SERVER},
 	{"ExperimentalProtocol", VAR_SERVER},
 	{"Forwarding", VAR_SERVER},
@@ -1738,34 +1789,34 @@ const var_t variables[] = {
 	{"IffOneQueue", VAR_SERVER},
 	{"Interface", VAR_SERVER},
 	{"InvitationExpire", VAR_SERVER},
-	{"KeyExpire", VAR_SERVER},
+	{"KeyExpire", VAR_SERVER | VAR_SAFE},
 	{"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
-	{"LocalDiscovery", VAR_SERVER},
+	{"LocalDiscovery", VAR_SERVER | VAR_SAFE},
 	{"LogLevel", VAR_SERVER},
-	{"MACExpire", VAR_SERVER},
-	{"MaxConnectionBurst", VAR_SERVER},
-	{"MaxOutputBufferSize", VAR_SERVER},
-	{"MaxTimeout", VAR_SERVER},
+	{"MACExpire", VAR_SERVER | VAR_SAFE},
+	{"MaxConnectionBurst", VAR_SERVER | VAR_SAFE},
+	{"MaxOutputBufferSize", VAR_SERVER | VAR_SAFE},
+	{"MaxTimeout", VAR_SERVER | VAR_SAFE},
 	{"Mode", VAR_SERVER | VAR_SAFE},
 	{"Name", VAR_SERVER},
-	{"PingInterval", VAR_SERVER},
-	{"PingTimeout", VAR_SERVER},
+	{"PingInterval", VAR_SERVER | VAR_SAFE},
+	{"PingTimeout", VAR_SERVER | VAR_SAFE},
 	{"PriorityInheritance", VAR_SERVER},
 	{"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
 	{"PrivateKeyFile", VAR_SERVER},
 	{"ProcessPriority", VAR_SERVER},
 	{"Proxy", VAR_SERVER},
-	{"ReplayWindow", VAR_SERVER},
+	{"ReplayWindow", VAR_SERVER | VAR_SAFE},
 	{"ScriptsExtension", VAR_SERVER},
 	{"ScriptsInterpreter", VAR_SERVER},
-	{"StrictSubnets", VAR_SERVER},
-	{"TunnelServer", VAR_SERVER},
-	{"UDPDiscovery", VAR_SERVER},
-	{"UDPDiscoveryKeepaliveInterval", VAR_SERVER},
-	{"UDPDiscoveryInterval", VAR_SERVER},
-	{"UDPDiscoveryTimeout", VAR_SERVER},
-	{"MTUInfoInterval", VAR_SERVER},
-	{"UDPInfoInterval", VAR_SERVER},
+	{"StrictSubnets", VAR_SERVER | VAR_SAFE},
+	{"TunnelServer", VAR_SERVER | VAR_SAFE},
+	{"UDPDiscovery", VAR_SERVER | VAR_SAFE},
+	{"UDPDiscoveryKeepaliveInterval", VAR_SERVER | VAR_SAFE},
+	{"UDPDiscoveryInterval", VAR_SERVER | VAR_SAFE},
+	{"UDPDiscoveryTimeout", VAR_SERVER | VAR_SAFE},
+	{"MTUInfoInterval", VAR_SERVER | VAR_SAFE},
+	{"UDPInfoInterval", VAR_SERVER | VAR_SAFE},
 	{"UDPRcvBuf", VAR_SERVER},
 	{"UDPSndBuf", VAR_SERVER},
 	{"UPnP", VAR_SERVER},
@@ -1776,12 +1827,12 @@ const var_t variables[] = {
 	/* Host configuration */
 	{"Address", VAR_HOST | VAR_MULTIPLE},
 	{"Cipher", VAR_SERVER | VAR_HOST},
-	{"ClampMSS", VAR_SERVER | VAR_HOST},
-	{"Compression", VAR_SERVER | VAR_HOST},
+	{"ClampMSS", VAR_SERVER | VAR_HOST | VAR_SAFE},
+	{"Compression", VAR_SERVER | VAR_HOST | VAR_SAFE},
 	{"Digest", VAR_SERVER | VAR_HOST},
 	{"Ed25519PublicKey", VAR_HOST},
 	{"Ed25519PublicKeyFile", VAR_SERVER | VAR_HOST},
-	{"IndirectData", VAR_SERVER | VAR_HOST},
+	{"IndirectData", VAR_SERVER | VAR_HOST | VAR_SAFE},
 	{"MACLength", VAR_SERVER | VAR_HOST},
 	{"PMTU", VAR_SERVER | VAR_HOST},
 	{"PMTUDiscovery", VAR_SERVER | VAR_HOST},
@@ -1789,7 +1840,7 @@ const var_t variables[] = {
 	{"PublicKey", VAR_HOST | VAR_OBSOLETE},
 	{"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
 	{"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
-	{"TCPOnly", VAR_SERVER | VAR_HOST},
+	{"TCPOnly", VAR_SERVER | VAR_HOST | VAR_SAFE},
 	{"Weight", VAR_HOST | VAR_SAFE},
 	{NULL, 0}
 };
@@ -1833,7 +1884,7 @@ static int cmd_config(int argc, char *argv[]) {
 	char *node = NULL;
 	char *variable;
 	char *value;
-	int len;
+	size_t len;
 
 	len = strcspn(line, "\t =");
 	value = line + len;
@@ -1880,6 +1931,20 @@ static int cmd_config(int argc, char *argv[]) {
 		found = true;
 		variable = (char *)variables[i].name;
 
+		if(!strcasecmp(variable, "Subnet") && *value) {
+			subnet_t s = {0};
+
+			if(!str2net(&s, value)) {
+				fprintf(stderr, "Malformed subnet definition %s\n", value);
+				return 1;
+			}
+
+			if(!subnetcheck(s)) {
+				fprintf(stderr, "Network address and prefix length do not match: %s\n", value);
+				return 1;
+			}
+		}
+
 		/* Discourage use of obsolete variables. */
 
 		if(variables[i].type & VAR_OBSOLETE && action >= 0) {
@@ -1927,6 +1992,11 @@ static int cmd_config(int argc, char *argv[]) {
 
 	if(node && !check_id(node)) {
 		fprintf(stderr, "Invalid name for node.\n");
+
+		if(node != line) {
+			free(node);
+		}
+
 		return 1;
 	}
 
@@ -1935,6 +2005,11 @@ static int cmd_config(int argc, char *argv[]) {
 			fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
 		} else {
 			fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
+
+			if(node && node != line) {
+				free(node);
+			}
+
 			return 1;
 		}
 	}
@@ -1944,6 +2019,11 @@ static int cmd_config(int argc, char *argv[]) {
 
 	if(node) {
 		snprintf(filename, sizeof(filename), "%s" SLASH "%s", hosts_dir, node);
+
+		if(node != line) {
+			free(node);
+			node = NULL;
+		}
 	} else {
 		snprintf(filename, sizeof(filename), "%s", tinc_conf);
 	}
@@ -2301,6 +2381,7 @@ static int cmd_init(int argc, char *argv[]) {
 
 static int cmd_generate_keys(int argc, char *argv[]) {
 #ifdef DISABLE_LEGACY
+	(void)argv;
 
 	if(argc > 1) {
 #else
@@ -3302,6 +3383,11 @@ static int cmd_shell(int argc, char *argv[]) {
 	return result;
 }
 
+static void cleanup() {
+	free(tinc_conf);
+	free(hosts_dir);
+	free_names();
+}
 
 int main(int argc, char *argv[]) {
 	program_name = argv[0];
@@ -3316,6 +3402,7 @@ int main(int argc, char *argv[]) {
 	make_names(false);
 	xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
 	xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
+	atexit(cleanup);
 
 	if(show_version) {
 		version();
@@ -3337,7 +3424,8 @@ int main(int argc, char *argv[]) {
 
 #endif
 
-	srand(time(NULL));
+	gettimeofday(&now, NULL);
+	srand(now.tv_sec + now.tv_usec);
 	crypto_init();
 
 	if(optind >= argc) {